Commit e3a00f68 authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'iommu-fixes-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU fixes from Joerg Roedel:

 - Four patches from Robin Murphy fix several issues with the recently
   merged generic DT-bindings support for arm-smmu drivers

 - A fix for a dead-lock issue in the VT-d driver, which shows up on
   iommu hotplug

* tag 'iommu-fixes-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Fix dead-locks in disable_dmar_iommu() path
  iommu/arm-smmu: Fix out-of-bounds dereference
  iommu/arm-smmu: Check that iommu_fwspecs are ours
  iommu/arm-smmu: Don't inadvertently reject multiple SMMUv3s
  iommu/arm-smmu: Work around ARM DMA configuration
parents b58ec8b5 bea64033
......@@ -2636,17 +2636,26 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
/* And we're up. Go go go! */
of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
#ifdef CONFIG_PCI
if (pci_bus_type.iommu_ops != &arm_smmu_ops) {
pci_request_acs();
ret = bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
if (ret)
return ret;
}
#endif
#ifdef CONFIG_ARM_AMBA
if (amba_bustype.iommu_ops != &arm_smmu_ops) {
ret = bus_set_iommu(&amba_bustype, &arm_smmu_ops);
if (ret)
return ret;
}
#endif
return bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
if (platform_bus_type.iommu_ops != &arm_smmu_ops) {
ret = bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
if (ret)
return ret;
}
return 0;
}
static int arm_smmu_device_remove(struct platform_device *pdev)
......
......@@ -324,8 +324,10 @@ struct arm_smmu_master_cfg {
#define INVALID_SMENDX -1
#define __fwspec_cfg(fw) ((struct arm_smmu_master_cfg *)fw->iommu_priv)
#define fwspec_smmu(fw) (__fwspec_cfg(fw)->smmu)
#define fwspec_smendx(fw, i) \
(i >= fw->num_ids ? INVALID_SMENDX : __fwspec_cfg(fw)->smendx[i])
#define for_each_cfg_sme(fw, i, idx) \
for (i = 0; idx = __fwspec_cfg(fw)->smendx[i], i < fw->num_ids; ++i)
for (i = 0; idx = fwspec_smendx(fw, i), i < fw->num_ids; ++i)
struct arm_smmu_device {
struct device *dev;
......@@ -1228,6 +1230,16 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
return -ENXIO;
}
/*
* FIXME: The arch/arm DMA API code tries to attach devices to its own
* domains between of_xlate() and add_device() - we have no way to cope
* with that, so until ARM gets converted to rely on groups and default
* domains, just say no (but more politely than by dereferencing NULL).
* This should be at least a WARN_ON once that's sorted.
*/
if (!fwspec->iommu_priv)
return -ENODEV;
smmu = fwspec_smmu(fwspec);
/* Ensure that the domain is finalised */
ret = arm_smmu_init_domain_context(domain, smmu);
......@@ -1390,7 +1402,7 @@ static int arm_smmu_add_device(struct device *dev)
fwspec = dev->iommu_fwspec;
if (ret)
goto out_free;
} else if (fwspec) {
} else if (fwspec && fwspec->ops == &arm_smmu_ops) {
smmu = arm_smmu_get_by_node(to_of_node(fwspec->iommu_fwnode));
} else {
return -ENODEV;
......
......@@ -1711,6 +1711,7 @@ static void disable_dmar_iommu(struct intel_iommu *iommu)
if (!iommu->domains || !iommu->domain_ids)
return;
again:
spin_lock_irqsave(&device_domain_lock, flags);
list_for_each_entry_safe(info, tmp, &device_domain_list, global) {
struct dmar_domain *domain;
......@@ -1723,10 +1724,19 @@ static void disable_dmar_iommu(struct intel_iommu *iommu)
domain = info->domain;
dmar_remove_one_dev_info(domain, info->dev);
__dmar_remove_one_dev_info(info);
if (!domain_type_is_vm_or_si(domain))
if (!domain_type_is_vm_or_si(domain)) {
/*
* The domain_exit() function can't be called under
* device_domain_lock, as it takes this lock itself.
* So release the lock here and re-run the loop
* afterwards.
*/
spin_unlock_irqrestore(&device_domain_lock, flags);
domain_exit(domain);
goto again;
}
}
spin_unlock_irqrestore(&device_domain_lock, flags);
......
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